Furnace-chimney and ventilator.



0. ST. JOHN. FURNACE CHIMNEY AND VBNTILATOR.

APPLICATION FILED SEPT. 8, 1910.

1,01 1,497. Patented Dec. 12, 1911.

44 2 SHEETS-SHEET 1.

0. ST. JOHN.

FURNACE CHIMNEY AND VENTILATOR.

APPLICATION FILEf) SEPT. 8; 1910 Patented Dec. 12, 1911.

2 SHEETS-SHEET 2.

. ID I Zuxlfnesses a 1 Mr.

cAnLrsLn sr. JOHN, or ions MOINES, IOWA.

FURNACE-CHIMNEY AND VENTILATCR.

Specification of Letters Patent.

Patented-Dec. 1-2, 1911.

To all whom it may concern:

Be it known that I, CARLISLE ST. JOHN, a

. citizen of the United States, residing at Des of the furnace.

A further object is to provide a chimney in which the upward current produced by the'rising smoke and gases maybe utilized in forcibly drawing from the building in which the chimney is contained the impure airfrom the various rooms. 7

A further object is to provide improved means for providing a forced draft for the fresh air intake of the chimney.

Myinvention consists in certain details, in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims and illustrated in the accompanying drawings, inwhich:

Figure 1 shows a vertical, central, sectional view of an improved. chimney embodying my invention arranged withina building and combined with the furnace as in use. Fig. 2 shows a detail, sectional view of the upper portion of a chimney and a building in which the chimney is contained illustrating a modification of the chimney and also illustrating a modified form of means for supplying a forced-current of fresh air downwardly through the chimney. Fig. 3 shows a detail, sectional View on the line 3-3 of Fig. 2, and Fig. 4 shows an enlarged, detail, sectional View on the line i 4 of Fig. 1.

Referring to the accompanying drawings, 1 have used the reference numeral 10 to indicatethe frame of a building in which the chimney is contained.

11 indicates a passageway between the first floor of the building and the ceiling of the cellar. i

12 indicates a hot air furnace of ordinary construction provided with a smoke due 13,

a cold air intake pipe 14-, and a number of hot air pipes 15, the latter being arranged to discharge heated air into the various rooms of the building.

The chimney proper comprises an outer wall 16 which may be made of brick or other suitable material and arranged centrally within the outer wall is an inner wall 17 which may be made of tiling or other suitable material and which is spaced apart from the outer wall thus leaving a fresh air passageway 18 in the center of the wall 1'? and a smoke passageway 19 between the walls 16 and 17. The smoke pipe 13'discharges into the smoke passageway 19 and at the lower end of the air passageway 18 is a lateral branch 20 extending into thehot air chamber of thefurnace 12. The construction of the chimney as described extends to a point adjacent'to the floor that is below the roof of the building. At this point I provide a chimney section which is preferably formed complete of one piece of concrete material and which comprises an outer wall 21 open at oneside at 22. This opening or passageway 22 extends down: wardly and inwardly and communicates with the cold air passageway 18 of the chimney below. Surrounding thecold air passageway 22 is a smoke passageway 23 which extends upwardly to the top of the body portion 21. These passageways are so arranged that there will be a free and unobstructedcold air passageway from the opening 22 to the passageway 18 and also a free and unobstructed smoke passageway from the space between the .walls 16 -and 17 at the bottom through the opening 23 at the top; that is to say, the smoke passageway surrounding the central wall 17 below the body portion '21 extends to the center of the body portion 21 at the'top thereof.

Above the body portion 21 is a chimney outer wall a; and within it an inner wali spaced apart from each other. The space 26 within the wall 25 receives the smoke and other products of combustion traveling through the passageway 23 while the space These. walls are between the walls and 25 formsaseparate passageway for the impure air from the building as will hereinafter appear.

In order to provide a forced draft for the cold air being supplied to the hot air chamber of the furnace, 1 place a fan 38 in the passageway 20 and said fan is operated by an electric motor 39. l have found that under ordinary circumstances no forced draft is necessary, but during certain unusual conditions of the weather it is desirable to provide a forced draft for the hot air.

In the modification shown in Fig. 2-, I have also shown a cap 44 to cover the passageway 35 and below this cap are the lateral openings 45 through which the impure air from. the rooms may be discharged laterally at the top of the chimney.

The heat arising from the fire will pass up between the inner and outer walls of the flue and tend to warm the inner wall. The hot air chamber of the furnace is, supplied only through the passageway 22 and the passageway 18 within the chimney wall 17 so that all of the air, before entering the hot air chamber of the furnace, must pm close to the wall 17 which is being heated by the furnace fire. Therefore the air, before being admit-ted into the furnace hot air chamber, will be partially heated and this will efiect a material saving in fuel; and furthermore by admitting the fresh air from a point near the top of a building it is possible to obtain air having less impurities and it also provides an opportunity for the operator to collect the fresh air for the furnace in such a manner that it may be thoroughly screened and subjected to direct rays of sunlight. Then at the top of the chimney, by having the hot air pass through the center and up providing a cold air chamber around it, the heat from the smoke and gases arising from the furnace will heat the wall 25 and thus create a draft upwardly through the space 35 and through this space 35 the impure air from the various rooms of the building may be drawn ofi by this forced draft in such a way as to provide a partial vacuum within the rooms being heated to thereby assist in the introduction of freshly heated air into said rooms.

- I claim as my invention:

1. An improved chimney of the class described, comprising a lower member consisting of an outer wall and arr---inner wall spaced apart from each other to provide a smoke passageway between the inner and outer walls, and a fresh air passageway for a furnace within the inner wall, a chimney section above said lower section having a passageway therein extending from an air inlet in one side downwardly and inwardly to communicate with the passageway within the inner wall of the lower section, said middle section being also provided with a passageway to communicate with .the smoke passageway of the lower section and arranged to discharge at its top near the center, and an upper chimney section composed of lnner and outer walls spaced apart, the space within the inner wall being in communication with the smoke passageway of the middle section.

2. An improved chimney of the class described, comprising a lower member consisting of an outer wall and an inner wall spaced apart from each other to provide a smoke passageway between the inner and outer walls and a fresh air passageway for a furnace within the inner wall, a chimney section above said lower section having a passageway therein extending from an air inlet 1n one side downwardly and inwardly to communicate with the passageway within the. inner wall of the lower section, said scribed, comprising a lower member con sisting of an outer wall and an inner wall spaced apart from each other to provide a smoke passageway between the inner and outer walls and a fresh air passageway for a furnace within the inner wall, a chimney section above said lower section having a passageway therein extending from an air inlet in one side downwardly and inwardly to communicate with the passageway within the inner wall of the lower section, said middle section being also provided with a passageway to communicate with the smoke passageway of the lower section and 'arranged to discharge at its top near the center, an upper chimney section composed of inner and outer walls spaced apart, the space within the inner wall being in communication with the smoke passageway of the middle section, and the space between the inner and outer walls of the upper section being provided with an opening at one side for permitting a forced draft upwardly for ventilating purposes, and means for providing a forced draft downwardly through the passageway within the inner wall of the lower section.

4;; An improved chimney of the class described, comprising a lower member consisting of an outer wall and an inner wall spaced apart from each other to provide a smoke passageway between the inner and outer walls and a fresh air passageway for a furnace within the inner wall, a chimney section above said lower section having a passageway therein extending from an air inlet in one side downwardly. and inwardly to communicate with the passageway within the inner wall of the lower section, said passageway of the middle section, and the middle section being also provided with a passageway to communicate with the smoke passageway of the lower section and arranged to discharge at its top near the cen ter, an upper'chimney section composed of inner and outer walls spaced apart, the inner wall being in communication with the smoke space between the inner and outer walls of the upper section being provided with an opening at one side for permitting a forced draft upwardly for ventilating purposes,

there being passageways below the cap to discharge air outwardly.

Des Moines, Iowa, Au ust 29, 1910.

CARLI LE ST. JOHN. Witnesses:

. MARY WALLACE,

ELIZABETH SKAHILL. 

